#include <iostream>
using std::cout;
using std::endl;

namespace wd
{
int num ;
//num = 400; //error

void print(){
    cout << "print()" << endl;
}

//print();//error
}

namespace wd
{
int num2 = 300;
//int num = 300;//error
}

using namespace wd;
void test0(){
    print();
    num = 500;
    cout << num << endl;
}


int main(void){
    test0();
    return 0;
}
